Guide-clamp for drill-rods



(No Model.)

J. P. GRISOOM.

GUIDE CLAMP FOR DRILL RODS.

Patented Oct '4. PETER: munm hn. 1mm 0. C.

UNITED STATES PATENT QFFICE.

JOHN P. GRISOOM, OF POTTSVILLE, PENNSYLVANIA.

GUIDE-CLAMP FOR DRILL-RODS.

SPECIFICATION forming part of Letters Patent No. 327,944, dated October 6, 1885.

Application filed May 29, 1885. Serial No. 167,043. (No model.)

To all whom it may concern:

Be it known that I, JOHN P. GRIscoM, a citizen of the United States, and a resident of Pottsville, Pennsylvania, have invented acertain Improved GuideGlamp for Drill-Rods, of which the following is a specification.

My invention consists of certain improvements in the construction of the safety-clamp for drilling-machines for which a patent was granted March 18, 1873, N 0. 136,812, the main object of my present invention being to avoid the necessity of taking the clamp apart when it is desired to allow the coupling or enlargement on the drill-rod to pass through the clamp, as was required in the old form.

In the accompanying drawings, Figure l is a vertical section on the line 1 2, Fig. 2, of a clamp embodying my invention. Fig. 2 is a plan view of the same, and Fig. 3 is a sectional view on the line 3 4., Fig. 2, showing the hinged blocks thrown back.

The frame is composed of two side plates connected together at one end by bolts a, and a filling or distance piece, a, while at the opposite end the side plates are connected together by a single bolt, b, which at the same times serves as a pivot-pin for one of the swinging clamp-blocks, hereinafter described. The frame may thus be said to be closed at one end by the filling-pieces and open at the other, while the sides are connected by the pivot-pin. A similar pin, b, intermediate between the opposite ends, forms the pivot for the other clamp-block.

B and B form the two movable parts of the clamp, and are in the form of blocks, one block, B, carrying the adjustable jaw D, which can be set up toward or from the other jaw by a headed adjusting-screw, d, and secured by a similar retaining-screw, d, passing through a slot in a log or flange, e, on the jaw, as in the above-described patent. The inner face of the jaw is grooved or provided with ratchet or gripping teeth out horizontally.

The block B carries the wedgingjaw D, which has vertical grooves on its curved gripping-face, and is maintained in an elevated position by means of a spring, 8, as in the abovedescribed patent.

On each of the side plates,A A, are formed side plates, while when the blocks are pulled or thrown back on their pivot-pins the lugs F will be lifted out of the notches and the blocks swung back until they rest against the stop'pins g g on the inner walls of the side plates. The pivot-pins pass through slots in the blocks B B, so that in raising the blocks to swing them back the first move ment is to lift the said blocks bodily a slight distance, so as to free the lugs from engagement with the recesses in the side plates.

The swinging blocks being pivoted at right angles to the line of the drill-rod, the elevation of the latter will bring the coupling or other enlargement in contact with the under side of the blocks carrying the jaws, and thereby automatically raise and swing the two blocks back until the coupling or other enlargement has passed, when the said blocks will fall back again into the former positions to grasp the drill-rod. When the blocks are in their normal positions shown in Fig. 1, they form practically a part of the frame, and the wedging-jaw D is relied on for the clamping action in connection with the adjustable jaw D, as the clamp opens automatically when pulling the rods through, and can be opened or shut very quickly.

By taking out the bolt or pin 1) the block B and its jaw can be withdrawn to remove the clamp laterally from around the drill-rod.

I claim as my invention 1. The combination of the frame of a drillclamp with blocks pivoted to the frame at right angles to the line of the drillrod, and one carrying a sliding wedge-jaw and the other an adjustable jaw, substantially as and for the purpose set forth.

2. The combination of the frame of a drillclamp having recesses f with hinged blocks carrying the clampingjaws, and having lugs F, adapted to said recesses, substantially as described.

3. The combination of the frame of a drillclamp having recesses f with hinged blocks having lugs F and clamping-jaws, and having siots through which the pivot-pins pass, snb- In testimony whereof I have signed my name 10 stantially as and for the purpose specified. to this specification in the presence of two sub- 4. The combination of the frame of a drillscribing witnesses. clamp closed at one endand open at the other 5 with a. pair of hinged blocks carrying the J N O. P. GRISCOM.

clamping-jaws and the pivot-pin b, for one of the jaws at the open end of theframe, forming Vitnesses: at the same time a connection for the two side THos. W. QUIN, plates of the latter. CHAS. E. EVANS. 

